This feature class includes Cooperative Management and Protection Areas, Forest Reserves, National Conservation Areas, National Monuments, and Outstanding Natural Areas. Descriptions of each type of polygon found in this feature class can be found on Page 21 of the National Landscape Conservation System (NLCS) Implementation Guidelines (Version 1.1). The Bureau of Land Management's National Conservation Lands include 19 national monuments in nine western states. These national monuments encompass landscapes of tremendous beauty and diversity, ranging from rugged California coastline to vividly-hued desert canyons. The Antiquities Act of 1906 grants the President authority to designate national monuments in order to protect “objects of historic or scientific interest.” National conservation areas (NCAs) and similarly designated lands are designated by Congress to conserve, protect, enhance, and manage public lands for the benefit and enjoyment of present and future generations. The Bureau of Land Management's National Conservation Lands include 16 NCAs and five similarly designated lands in ten states. These lands feature exceptional scientific, cultural, ecological, historical, and recreational values. They differ tremendously in landscape and size, varying from the coastal beauty of California's 18-acre Piedras Blancas Light Station Outstanding Natural Area to the rugged desert vistas of Nevada's 1.2 million acre Black Rock Desert-High Rock Canyon Emigrant Trails NCA.